T2 values for discs at different Pfirrmann grades.

*Compared with T2 values of nucleus pulposus (NP) of grade I, P@Compared with T2 values of NP of grade II. P value: compared with each anterior anulus fibrosus (AAF), NP and posterior anulus fibrosus (PAF) among grade I, II, and III.* 与I级髓核（nucleus pulposus, NP）的T2值及II级髓核的T2值进行比较。P值相关统计：在I、II、III级分组中，分别对各前纤维环（anterior anulus fibrosus, AAF）、髓核与后纤维环（posterior anulus fibrosus, PAF）的T2值开展统计学对比。